javascript_tutorial

28. DOM
Javascript
Every web page resides inside a browser window which can be considered as an
object.
A Document object represents the HTML document that is displayed in that
window. The Document object has various properties that refer to other objects
which allow access to and modification of document content.
The way a document content is accessed and modified is called the Document
Object Model, or DOM. The Objects are organized in a hierarchy. This
hierarchical structure applies to the organization of objects in a Web document.
Window object: Top of the hierarchy. It is the outmost element of the
object hierarchy.
Document object: Each HTML document that gets loaded into a window
becomes a document object. The document contains the contents of the
page.
Form object: Everything enclosed in the ... tags sets the
form object.
Form control elements: The form object contains all the elements
defined for that object such as text fields, buttons, radio buttons, and
checkboxes.
Here is a simple hierarchy of a few important objects:
325